Girder



Patented Aug, 1927.

LAUn noEs,rationMan, or 'nnwiroeanjr; Assrenon' 'ro univERsA ELECTRIC 'wnnnine .oo vrrAnY, A CORPORATION or nnw yonrc.

- Gianna.

Application filed November}, 1923;"Seria1 No; 673,657. Renewed May 5, 192?;

My invention relates to a construction of electrically welded girders, beams or the like and more particularly to the construction of aiskeleton type wherein the members forming struts or braces connecting the two longitudinals consist of a .bar or bars instead of a plate. The object of my-invention is to provide a girder or like structure whichwill afford great stiffness or strength to resist deforming forces exerted in the general plane 'of-the girder as well as twisting or distortioning forces exerted in a direction transverse to the general plane of the girder and by a construction which shall be very strong for the amount of material employed and which may likewise be readily made up by the use of electrical resistance and'pressure method ofwelding.

To these e'ndsmy invent-ion consistsin the construction of a girder or the like hereinafter described and more particularly specified in the claims. 7

In the accompanying drawings: Fig. 1 is a side elevation of a portion of a girder embodying my invention.

Fig-.2 is a vertical cross section of Fig. 1 on the line 2'-2 t Fig. 3 is a top view of the construction. Referring to the drawingsz Each longitudinal or the upper and lower members of the girder consists of an angle bar 1. These longitudinals are disposed with the outer 'angles projecting upwardly and downwardly respectively min a direction towards one another. and in the same geiieral planeis located a connecting strut, brace or diagonal 2 preferably formed by bendinga flat bar or plate into fzig-zag shape asshown thereby cheapeiiing the construction and lessening the ber 2 consists of a plate or bar disposed with the plane of said bar transverse tothe gen eral plane of thegirder or structure and is preferably. of such width" as to be embraced) within or to be flush with the transverse? edges of the members 1." Said plate 2 is I provided preferably with one or more longi- .tudinal ridges 3 and its fiat outer face at presented and arranged in relation'tolthe,

the bends is engaged by and welded to the corners or outer edges of the anglebars 1 as sliown.- The angles of said'bars'l as thus Between them flat plate 2 afford zones'or points of limited contact areawhich are useful insetting upf the electric resistance when-the parts-are I assembled betweei'i weldiiig \dies' ywhichi i inthe inner angle and by'their sliape and c-o-opera'tion with the bars l are automatically centered or located when 'thepressure isapplied. 'As will be understood the elec trical weld is Of'itt homogeneous character;

involving the metal ofthe outside surface of the bends and the corner "orfoutside angle ofthe' bars'l. Usually the outside corner or outside anglebecomes embedded in the surface of'the bar 2 to a greater or" less extent and the outside faces of tlieibar 1 are preferably causedbythepressurei to I seat themselves upon the ridges 8. By these] means the stability and strength o f-the structure is enchanced' at the joint; As will be seen, the angle bars 1, owing to their a shape and disposition not only afford great resistance to compression but also by' their relative disposition and arrangement, with.

so; f

relation to the plate zig-zag 2'contributeto ease in manufacturing by electrically welds ing the parts together. 'Furtlieriiiore, the.

"plate 2 being disposed as described effectu l H v a'lly resists forces tending to distort or j'deform theistructu're' in'a planetransverseto the general plane thereof,"while bars 1 oW-Q ing'to their shape contribute to that 'r'e sist- 1 ance bothbyreason of their shape and by} thereon and by the between-the ridges. I I What I claim as my invention is: J

Ito the bends of the zigzag members attheir in" v 'reason'of theiribeingsecurely anchored to i the plate 2 by engagement with the ridges; i

electrical weld formed.

apices so-that the sides of an angle member seat 'upo 'the' projections.-

2. A skeleton girder comprising parallel angle members, the apices, of which oppose" each other,a zigzag member provided-with arallel ribsgthe angle members being elec-' tricallj welded at their apices t0 thebends r of the zigzag member so that the sides of an angle member 'seat upon the ribs.

3: A skeleton girder comprising parallel the angle members being electrically welded at their apiees to 'the bends of the zigzagfl member so that the ribs of an anglemember'seat upon the ribs;

Signecl'at New York .ili the coiinty' of New York of N0 and State of New YQrk'thiS'Sth Vember, A. D. 1923. i

LAURENCE s. LACHMAN. l 

